A nearly stationary front extended east-southeast to west-northwest across Iowa.  Cooler and drier air was to the north of the front, with very warm and unstable air to the south.  Dew point temperatures approached 70 to the south of the boundary during the morning hours of the 8th.  A short wave tracked southeast across the area in a general northwest flow.  The air mass became quite unstable in the vicinity of the boundary with lifted indices around -7 C.  The shear profile was favorable with about 40 kts of shear in the lower layers.  Plenty of deep moisture was available with the system with precipitable water values in the 1.5 to 1.8 inch range.  Hail was somewhat limited with the storms, but not absent with freezing levels in the 12,500 to 13,000 foot range.  CAPE values ahead of the storms were in the 1500 to 2000 J/kg range, with CAPE in the -10 C to -30 C layer of the atmosphere in the 400 J/kg range.  Thunderstorms which began well to the northwest during the previous night tracked southeast into Iowa during the morning of the 8th.  A steady flow of moisture was transported into the area with a feed at 850 mb of about 25 kts.  The storms were fast moving and the area tended to bow out.  Wind damage was wide spread with numerous reports of winds of 60 to 70 MPH.  An intense cluster of storms moved through the central Iowa area with measured wind gusts of 83 MPH reported at both Ames and Ankeny with the gust front passage.  There was one reported tornado with the system in Ames.  The tornado touched down near the power plant o nthe ISU Campus.  Eight people were injured by the tornado.  One was injured seriously enough to be taken to hospital.  Initial damage estimates were around $150,000.  Many of the storms produced hail, however much of the hail was below severe limits. Reports of penny size hail were received from several locations.   The largest hail came with the cluster in central Iowa.  Golf ball size hail fell west of Elkhart in Polk County.  The storm and high winds resulted in power outages to 8700 customers in the Des Moines area.  The high winds caused a semi-tractortrailer and a camper to oberturn on INterstate 80 just west of exit 141 in Polk County.  The thunderstorms also produced locally heavy rainfall.  Local flooding occurred on the north side of Indianola as the storms moved through.

Hail in EMMET, IOWA
From 08-SEP-05 08:30:00 to 08-SEP-05 08:30:00 (CST)
Location: ARMSTRONG
Magnitude: 1.00 
Property damage: 3K
Crop damage: 5K
Reported by: POST OFFICE

Thunderstorm Wind in POCAHONTAS, IOWA
From 08-SEP-05 09:39:00 to 08-SEP-05 09:39:00 (CST)
Location: HAVELOCK
Magnitude: 52 EG
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in CALHOUN, IOWA
From 08-SEP-05 10:10:00 to 08-SEP-05 10:10:00 (CST)
Location: ROCKWELL CITY
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in HUMBOLDT, IOWA
From 08-SEP-05 10:15:00 to 08-SEP-05 10:15:00 (CST)
Location: HUMBOLDT
Magnitude: 50 EG
Property damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in CALHOUN, IOWA
From 08-SEP-05 10:24:00 to 08-SEP-05 10:24:00 (CST)
Location: FARNHAMVILLE
Magnitude: 54 MG
Property damage: 5K
Crop damage: 5K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in MAHASKA, IOWA
From 08-SEP-05 13:30:00 to 08-SEP-05 13:30:00 (CST)
Location: KEOMAH
Magnitude: 50 EG
Property damage: 3K
Reported by: POST OFFICE

Thunderstorm Wind in POLK, IOWA
From 08-SEP-05 11:57:00 to 08-SEP-05 11:57:00 (CST)
Location: ALTOONA
Magnitude: 57 EG
Property damage: 15K
Crop damage: 5K
Reported by: AMATEUR RADIO

Hail in POLK, IOWA
From 08-SEP-05 12:00:00 to 08-SEP-05 12:00:00 (CST)
Location: ELKHART
Magnitude: 1.75 
Property damage: 10K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Hail in POLK, IOWA
From 08-SEP-05 12:10:00 to 08-SEP-05 12:10:00 (CST)
Location: PLEASANT HILL
Magnitude: 1.50 
Property damage: 15K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in JASPER, IOWA
From 08-SEP-05 12:10:00 to 08-SEP-05 12:10:00 (CST)
Location: COLFAX
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in POLK, IOWA
From 08-SEP-05 12:10:00 to 08-SEP-05 12:10:00 (CST)
Location: ALTOONA
Magnitude: 61 EG
Property damage: 5K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MARSHALL, IOWA
From 08-SEP-05 12:10:00 to 08-SEP-05 12:10:00 (CST)
Location: MARSHALLTOWN
Magnitude: 52 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in JASPER, IOWA
From 08-SEP-05 12:15:00 to 08-SEP-05 12:15:00 (CST)
Location: BAXTER
Magnitude: 57 EG
Property damage: 10K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WARREN, IOWA
From 08-SEP-05 12:25:00 to 08-SEP-05 12:25:00 (CST)
Location: HARTFORD
Magnitude: 52 EG
Property damage: 3K
Reported by: AMATEUR RADIO

Hail in WARREN, IOWA
From 08-SEP-05 12:25:00 to 08-SEP-05 12:25:00 (CST)
Location: HARTFORD
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: AMATEUR RADIO

Thunderstorm Wind in WARREN, IOWA
From 08-SEP-05 12:30:00 to 08-SEP-05 12:30:00 (CST)
Location: HARTFORD
Magnitude: 57 EG
Property damage: 5K
Crop damage: 3K
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in POWESHIEK, IOWA
From 08-SEP-05 13:05:00 to 08-SEP-05 13:05:00 (CST)
Location: BROOKLYN
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in POLK, IOWA
From 08-SEP-05 11:50:00 to 08-SEP-05 11:50:00 (CST)
Location: ANKENY
Magnitude: 52 EG
Property damage: 2K
Reported by: AMATEUR RADIO

Thunderstorm Wind in POLK, IOWA
From 08-SEP-05 11:51:00 to 08-SEP-05 11:51:00 (CST)
Location: ANKENY
Magnitude: 72 MG
Property damage: 15K
Crop damage: 10K
Reported by: AMATEUR RADIO

Thunderstorm Wind in POLK, IOWA
From 08-SEP-05 11:55:00 to 08-SEP-05 11:55:00 (CST)
Location: ANKENY
Magnitude: 65 MG
Property damage: 10K
Crop damage: 10K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in POLK, IOWA
From 08-SEP-05 11:55:00 to 08-SEP-05 11:55:00 (CST)
Location: ANKENY
Magnitude: 61 EG
Property damage: 20K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 08-SEP-05 11:57:00 to 08-SEP-05 11:57:00 (CST)
Location: DES MOINES
Magnitude: 0.88 
Property damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in POWESHIEK, IOWA
From 08-SEP-05 13:07:00 to 08-SEP-05 13:07:00 (CST)
Location: BROOKLYN
Magnitude: 52 MG
Property damage: 5K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in MONROE, IOWA
From 08-SEP-05 13:15:00 to 08-SEP-05 13:15:00 (CST)
Location: LOVILIA
Magnitude: 52 EG
Property damage: 3K
Reported by: POST OFFICE

Flood in WARREN, IOWA
From 08-SEP-05 13:20:00 to 08-SEP-05 14:20:00 (CST)
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARION, IOWA
From 08-SEP-05 12:35:00 to 08-SEP-05 12:35:00 (CST)
Location: KNOXVILLE
Magnitude: 55 EG
Property damage: 5K
Crop damage: 3K
Reported by: BROADCAST MEDIA

Thunderstorm Wind in POWESHIEK, IOWA
From 08-SEP-05 12:45:00 to 08-SEP-05 12:45:00 (CST)
Location: GRINNELL
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in CALHOUN, IOWA
From 08-SEP-05 10:25:00 to 08-SEP-05 10:25:00 (CST)
Location: KNIERIM
Magnitude: 52 EG
Property damage: 5K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WEBSTER, IOWA
From 08-SEP-05 10:30:00 to 08-SEP-05 10:30:00 (CST)
Location: FT DODGE
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in GREENE, IOWA
From 08-SEP-05 10:50:00 to 08-SEP-05 10:50:00 (CST)
Location: PATON
Magnitude: 54 EG
Property damage: 10K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in BOONE, IOWA
From 08-SEP-05 11:20:00 to 08-SEP-05 11:20:00 (CST)
Location: BOONE
Magnitude: 50 EG
Property damage: 3K
Reported by: GENERAL PUBLIC

Thunderstorm Wind in BOONE, IOWA
From 08-SEP-05 11:35:00 to 08-SEP-05 11:35:00 (CST)
Location: MADRID
Magnitude: 52 EG
Property damage: 3K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in STORY, IOWA
From 08-SEP-05 11:36:00 to 08-SEP-05 11:36:00 (CST)
Location: AMES
Magnitude: 71 MG
Property damage: 15K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in DALLAS, IOWA
From 08-SEP-05 11:45:00 to 08-SEP-05 11:45:00 (CST)
Location: BOUTON
Magnitude: 52 EG
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 08-SEP-05 11:45:00 to 08-SEP-05 11:45:00 (CST)
Location: ALLEMAN
Magnitude: 1.00 
Property damage: 3K
Crop damage: 5K
Reported by: AMATEUR RADIO

Thunderstorm Wind in POLK, IOWA
From 08-SEP-05 11:45:00 to 08-SEP-05 11:45:00 (CST)
Location: ALLEMAN
Magnitude: 52 EG
Property damage: 2K
Reported by: AMATEUR RADIO

Thunderstorm Wind in BOONE, IOWA
From 08-SEP-05 11:30:00 to 08-SEP-05 11:30:00 (CST)
Location: MADRID
Magnitude: 54 EG
Property damage: 5K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in STORY, IOWA
From 08-SEP-05 11:30:00 to 08-SEP-05 11:30:00 (CST)
Location: AMES
Magnitude: 57 EG
Property damage: 5K
Reported by: GENERAL PUBLIC

Thunderstorm Wind in BOONE, IOWA
From 08-SEP-05 11:30:00 to 08-SEP-05 11:30:00 (CST)
Location: MADRID
Magnitude: 54 MG
Property damage: 5K
Reported by: AWOS,ASOS,MESONET,ETC

Tornado in STORY, IOWA
From 08-SEP-05 11:30:00 to 08-SEP-05 11:30:00 (CST)
Location: AMES
Tornado F-scale: F1
Property damage: 150K
Reported by: TRAINED SPOTTER

A tornado touched down in the central Campas Area of ISU.  Eight injuries occurred, one serious enough to require hospitalization.

Thunderstorm Wind in STORY, IOWA
From 08-SEP-05 11:35:00 to 08-SEP-05 11:35:00 (CST)
Location: AMES
Magnitude: 72 MG
Property damage: 10K
Crop damage: 5K
Reported by: AWOS,ASOS,MESONET,ETC